metalayer-crawler is the only one that is reccomended to kill. If your SD card gets corrupted, it will run continuously and drain your battery in a couple hours. Maemo-control-services makes disabling it easy. Read that first (and backup), disabling some items will cause endless reboot, causing reflash.

To disable from command line:
update-rc.d metalayer-crawler remove

Unrelated: From your topic I thought this could help, but turns out it's not what you were talking about.